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# Year 10 Lesson on speed

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Introducing my year 10 students to the formula triangle and how it works

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### Year 10 Lesson on speed

1. 1. Speed
2. 2. Your mission is:• Pair up – or jump in a 3, or do this individually – your choice (tryyour best to pair up)• You will have a timer between you to share.• 1. One person will time, the other will walk/run 100m• When finished, record the time you took to run/walk.• 2. Swap – the timer will now run 100m, the runner will now time.• Make sure to record the time it took you to run/walk 100m!• We will come back up here and calculate our speed!
3. 3. Speed can be measured in:•Kilometres per hour (km/h)•Metres per second (m/s)
4. 4. The formula triangle!!
5. 5. To find distance, weremove it from thetriangle
6. 6. To find time, weremove it from thetriangle
7. 7. To find speed, weremove it from thetriangle
8. 8. Question•Daisha drove hercar 70km at anaverage speed of35km/h – Howlong was thejourney?Distance = 70kmSpeed = 35 km/h• Time = distance ÷ speed• Time = 70 ÷ 35• Time = 2• We have used the unit“kilometres per hour” so ouranswer is 2 hours
9. 9. Question• John missed thebus to had to walkhome from school.It took him 2 hours.His average speedwas 6km/h – howfar away fromschool does Johnlive?Speed = 6km/hTime= 2 hours• Distance = speed x time• Distance = 6km/h x 2 hours• Distance = 6 x 2• = 12 kilometres
10. 10. Question•Kritesh ran 100min 9.58seconds, whatwas his averagespeed?Distance = 100mTime= 9.58 seconds• Speed = distance ÷ time• Speed = 100 ÷ 9.58• Speed = 10.43• So Kritesh was travelling at10.43 meters per second(m/s)